We have seen Anna Windass getting Michael killed becauae of her hate for Phelan. But did her family also kill off Gails other bloke who was Joe McIntyre when he hired Edfie to do Gails kitchen. But he could not find the money to pay for it so he had to go to a Loan shark and then he got into some serious debt because the family overcharged him

That's a good points.

I'm guessing that they involved Anna so she can't really kick off about David as she will feel guilty about the Michael thing

No!!
Michael was responsible for his own death!!

Anna wasn't even going to get involved until she heard Phelan's phone message from Vinnie, which she gave to Michael to help him uncover Phelan & Vinnie's scam!!